<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>我的扩展</title>
    <style>
        body {
            width: 200px;
            height: 150px;
            font-family: Arial, sans-serif;
        }
        h1 {
            font-size: 16px;
            color: #333;
        }
        button {
            padding: 10px;
            margin-top: 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
    </style>
</head>
<body>
<h1>点击按钮</h1>
<button id="myButton">点击我</button>

<script>
    document.getElementById('myButton').addEventListener('click', function() {
        alert('按钮已点击！');
    });


</script>
</body>
</html>
